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  • Title: Circadian properties of anticipatory activity to restricted water access in suprachiasmatic-ablated hamsters.
    Author: Mistlberger RE.
    Journal: Am J Physiol; 1993 Jan; 264(1 Pt 2):R22-9. PubMed ID: 8430882.
    Abstract:
    This study provides evidence that anticipation of daily water access in hamsters is regulated by nonphotically entrainable circadian oscillators located outside of the suprachiasmatic nuclei (SCN). Intact and SCN-ablated hamsters receiving 2 h/day water access ate large meals (representing 17-55% of daily food intake) during the 2-h access time. Two of nine SCN-intact hamsters, five of five hamsters with partial SCN ablations, and seven of nine hamsters with total SCN ablations showed anticipatory wheel-running rhythms synchronized to water access time. These anticipation rhythms usually disappeared during subsequent ad libitum water access but reappeared when the hamsters were water deprived for 2 days. When the water restriction schedule was shortened to an 18-h interval in six SCN-ablated hamsters, an 18-h activity rhythm emerged that usually did not persist during water deprivation. When the schedule was lengthened to 30-h intervals, several hamsters showed 27- to 29-h rhythms that did not stably synchronize to water access time. These results indicate that hamsters, like rats, possess a non-SCN-based water- and/or food-entrainable, self-sustaining oscillator with circadian limits to entrainment.
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